 
(* ::Section:: *)
(* SISD *)
(* ::Text:: *)
(*SISD[p] can be used as input for D-1-dimensional $\sigma ^{\mu }p_{\mu }$ with D-dimensional Lorentz vector p and is transformed into PauliSigma[Momentum[p,D],D-1] by FeynCalcInternal..*)


(* ::Subsection:: *)
(* Examples *)
SISD[p]

SISD[p]//FCI//StandardForm

SISD[p,q,r,s]

SISD[p,q,r,s]//StandardForm

SISD[q].(SISD[p]+m).SISD[q]
